Refrigerating apparatus



D66. 1, 3 D A REFRIGERATING APPARATUS Filed May 28. 1930 A 77' ORNE Y WMM @QQQQQQ QQQ I! ||l h w M, 9m

BY gall/$51? Patented Dec. 1, 1931,

UNITED STATES PATENT, OFFICE STANLEY Di: WAAL, OF SAN ANTONIO, TEXAS, ASSIGNOR TOFRIGIDAIRE CORPORATION,

OF DAYTON, OHIO, A. CORPORATION OF DELAWARE mmemrmo .arrmrns Application filed May 28, 1930. 7 Serial No. 456,618.

This invention relates to evaporators for refrigerating apparatus and more particularly to the refrigerant control mechanism for such evaporators.

One of the objects of this invention is to provide an improved refrigerant control mechanism for an evaporator for a refrige'rating apparatus, which control mechanism includes a valve, and to arrange said mechanism in such a manner so as to prevent dam.-

age to said valve or its seat in the event said evaporator is subjected to abnormal conditions.

More specifically it is an object to prevent the aforesaid valve from jamming its seat during transportation of said evaporator.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings;

Fig. l is a view illustrating diagrammatically a refrigerating system including the evaporator, on a larger scale, embodying features of the present invention, said evaporator being shown in cross section, and

Fig. 2 is a fragmentary view of apportion of the evaporator shown in Fig. 1, the view being taken in the direction of the arrows 2'2.

Referring to the drawings, the numeral 20 designates in general an evaporator, comprising a header or container 21 forming a reservoir for liquid refrigerant, such as sulphur dioxide, and from which header depends a plurality of refrigerant conveying ducts 22 for conveying the refrigerant to the zone or place to be refrigerated. Refrigerant is delivered to the header through refrigerant conveying pipe 24 and is withdrawn through a vapor pipe 25. The pipe 24 is connected with a receiver 27 and the pipe 25 is connected to the low pressure side of a compressor 30, preferably as shown to the crank case thereof. The high pressure side of the compressor is connected with a condenser 31 which in turn is connected with the receiver 27. The compressor is herein shown as driven by a motor 33 which is controlled in response to the pressure within the pipe 25 by means of an automatic switch 34 which connects the motor with the power mains 35.

The header 21 which is herein shown as a refrigerant containing chamber is formed of a drawn sheet metal tube. having'one end thereof open which receives a ring 40- which is suitably sealed in position. A head or valve plate 42 is secured to the ring 40 by screws 43 and carries shut off valves 44 and 45 which are connected respectively with pipes 24 and 25. The head 42 is provided with an opening 47 communicating with the valve 45 and carries an inwardly extending and upwardly sloping tube 48 for conve ing gaseous refrigerant from the free space a ove the liquid in the refrigerating chamber. The head 37 is also provided with a cylindrically shaped inwardly extending boss 50 having a screened opening 51 which communicates with the valve 44. The size'of the opening 51 is reduced to a sinall orifice 531which provides a seat for a needle valve 55. A sleeve 58 is secured to the boss 50 and is provided with an inwardly extending ledge or support 60 for supporting a float lever 61 and float 62. The float lever is of the bell crank type, one end thereof carrying the float 62 and the other end being operatively connected with the needle valve by a ivotal connection 63. The support is bifurcated at 65 to receive a portion of the float lever 61.

The float lever 61 is pivotally mounted between the forks of the support 60 by means of a pin 67 carried by the lever 61, which pin extends through aligned slots 68 provided in the forks of said sup-port. The aligned slots 68 provide a fulcrum for the float lever 61.

7 It will be apparent from the foregoing that the flow of refrigerant through the evaporator will be controlled by the needle valve. 55 which controls the flow of refrig erant from the receiver 31 and this flow is responsive to the float 62 so that When a predetermined quantity of refrigerant is contained within the chamber 21, the float will close or tend toclose the needle valve and thus stop or impede'the flow of refrigerant to the evaporator. For the purpose of illustration I have shown the refrigerant level at 80 and an oil level at 81. I

When the pin 67 is in the position shown a in thedrawings, the float 62 will be in" its viewed in the drawings, during normal operation of the float. Thus, when the pin is in the position shown, the float lever 61 will be maintained in'its'normal operating position.

In the event the mechanism including the float is subjected to abnormal conditions, such as severe shocks, such as may occur during transportation of the evaporator, the float 62 would be jarred upwardly very quickly and if it were not for the yieldable mounting of said float lever, said float would jam the needle valve 55 into its seat and thereby damage said valve or its seat. Thus, when this abnormal condition occurs, the. springs will yield and permit the pin 67 to slide to the right in the slots 68, as viewed in the drawings, to thus prevent said float mechanism from jamming the needle valve into its seat by avoiding the direct thrust of the float lever upon the valve 55. After the shocking or jarring of the float is over,.the springs 70 will return the. pin 67 to the position shown in the drawings.

In order to prevent the valve 55 from being removed too far from its seat, the float lever 61 is provided with a stop which engages the support 60 when the float lever 61 reaches a predetermined position.

While the form of embodiment of the invention as herein disclosed constitutes a preferred form, it is to be understood that other formsmight be adopted, all coming'within the scope of the claims which follow.

What is claimed is as follows: Y

1. In an evaporator for refrigerating apparatus, the combination with a valve, of a float for actuating said valve, and means for yieldably maintaining said float in normal operating position.

2. In an evaporator for refrigerating apparatus, the combination with a valve, of afloat for actuating said valve, a support for said float, and means for yieldably maintaining said float ina predetermined position with respect to said support. 3. In an evaporator for refrigerating apparatus, the combination with a valve, of a float for actuating said valve, a support for said float, and resilient means for normally maintaining said float in a predetermined position with respect'to said support.

4. In an evaporator for a refrigerating apparatus, the combination with a valve, of a float for actuating said valve, said float being pivotally connected with the valve, and resilient means for normally maintaining said pivotal connection in a predetermined position.

5. In an evaporator for a refrigerating apparatus, the combination with a valve, a float,

a float stem having a pivotal connection with said valve, a support for said float and stem, said support serving as a fulcrum for said float and stem, and resilient means normally maintaining a predetermined fulcrum for said float and stem.

point 6. In an evaporator for arefrigerating apparatus, the combination with means formmg a reservoir for liquid refrlgerant, of

means forming a restricted passageway, a

nature. I

STANLEY DE WA'AL. 

